/** * struct devfreq_dev_status - Data given from devfreq user device to * governors. Represents the performance * statistics. * @total_time: The total time represented by this instance of * devfreq_dev_status * @busy_time: The time that the device was working among the * total_time. * @current_frequency: The operating frequency. * @private_data: An entry not specified by the devfreq framework. * A device and a specific governor may have their * own protocol with private_data. However, because * this is governor-specific, a governor using this * will be only compatible with devices aware of it.
*/ struct devfreq_dev_status { /* both since the last measure */ unsignedlong total_time; unsignedlong busy_time; unsignedlong current_frequency; void *private_data;
};
/* * The resulting frequency should be at most this. (this bound is the * least upper bound; thus, the resulting freq should be lower or same) * If the flag is not set, the resulting frequency should be at most the * bound (greatest lower bound)
*/ #define DEVFREQ_FLAG_LEAST_UPPER_BOUND 0x1
/** * struct devfreq_dev_profile - Devfreq's user device profile * @initial_freq: The operating frequency when devfreq_add_device() is * called. * @polling_ms: The polling interval in ms. 0 disables polling. * @timer: Timer type is either deferrable or delayed timer. * @target: The device should set its operating frequency at * freq or lowest-upper-than-freq value. If freq is * higher than any operable frequency, set maximum. * Before returning, target function should set * freq at the current frequency. * The "flags" parameter's possible values are * explained above with "DEVFREQ_FLAG_*" macros. * @get_dev_status: The device should provide the current performance * status to devfreq. Governors are recommended not to * use this directly. Instead, governors are recommended * to use devfreq_update_stats() along with * devfreq.last_status. * @get_cur_freq: The device should provide the current frequency * at which it is operating. * @exit: An optional callback that is called when devfreq * is removing the devfreq object due to error or * from devfreq_remove_device() call. If the user * has registered devfreq->nb at a notifier-head, * this is the time to unregister it. * @freq_table: Optional list of frequencies to support statistics * and freq_table must be generated in ascending order. * @max_state: The size of freq_table. * * @is_cooling_device: A self-explanatory boolean giving the device a * cooling effect property. * @dev_groups: Optional device-specific sysfs attribute groups that to * be attached to the devfreq device.
*/ struct devfreq_dev_profile { unsignedlong initial_freq; unsignedint polling_ms; enum devfreq_timer timer;
int (*target)(struct device *dev, unsignedlong *freq, u32 flags); int (*get_dev_status)(struct device *dev, struct devfreq_dev_status *stat); int (*get_cur_freq)(struct device *dev, unsignedlong *freq); void (*exit)(struct device *dev);
unsignedlong *freq_table; unsignedint max_state;
bool is_cooling_device;
conststruct attribute_group **dev_groups;
};
/** * struct devfreq_stats - Statistics of devfreq device behavior * @total_trans: Number of devfreq transitions. * @trans_table: Statistics of devfreq transitions. * @time_in_state: Statistics of devfreq states. * @last_update: The last time stats were updated.
*/ struct devfreq_stats { unsignedint total_trans; unsignedint *trans_table;
u64 *time_in_state;
u64 last_update;
};
/** * struct devfreq - Device devfreq structure * @node: list node - contains the devices with devfreq that have been * registered. * @lock: a mutex to protect accessing devfreq. * @dev: device registered by devfreq class. dev.parent is the device * using devfreq. * @profile: device-specific devfreq profile * @governor: method how to choose frequency based on the usage. * @opp_table: Reference to OPP table of dev.parent, if one exists. * @nb: notifier block used to notify devfreq object that it should * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. * @freq_table: current frequency table used by the devfreq driver. * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: devfreq driver pass to governors, governor should not change it. * @governor_data: private data for governors, devfreq core doesn't touch it. * @user_min_freq_req: PM QoS minimum frequency request from user (via sysfs) * @user_max_freq_req: PM QoS maximum frequency request from user (via sysfs) * @scaling_min_freq: Limit minimum frequency requested by OPP interface * @scaling_max_freq: Limit maximum frequency requested by OPP interface * @stop_polling: devfreq polling status of a device. * @suspend_freq: frequency of a device set during suspend phase. * @resume_freq: frequency of a device set in resume phase. * @suspend_count: suspend requests counter for a device. * @stats: Statistics of devfreq device behavior * @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier * @cdev: Cooling device pointer if the devfreq has cooling property * @nb_min: Notifier block for DEV_PM_QOS_MIN_FREQUENCY * @nb_max: Notifier block for DEV_PM_QOS_MAX_FREQUENCY * * This structure stores the devfreq information for a given device. * * Note that when a governor accesses entries in struct devfreq in its * functions except for the context of callbacks defined in struct * devfreq_governor, the governor should protect its access with the * struct mutex lock in struct devfreq. A governor may use this mutex * to protect its own private data in ``void *data`` as well.
*/ struct devfreq { struct list_head node;
/** * struct devfreq_simple_ondemand_data - ``void *data`` fed to struct devfreq * and devfreq_add_device * @upthreshold: If the load is over this value, the frequency jumps. * Specify 0 to use the default. Valid value = 0 to 100. * @downdifferential: If the load is under upthreshold - downdifferential, * the governor may consider slowing the frequency down. * Specify 0 to use the default. Valid value = 0 to 100. * downdifferential < upthreshold must hold. * * If the fed devfreq_simple_ondemand_data pointer is NULL to the governor, * the governor uses the default values.
*/ struct devfreq_simple_ondemand_data { unsignedint upthreshold; unsignedint downdifferential;
};
/** * struct devfreq_passive_data - ``void *data`` fed to struct devfreq * and devfreq_add_device * @parent: the devfreq instance of parent device. * @get_target_freq: Optional callback, Returns desired operating frequency * for the device using passive governor. That is called * when passive governor should decide the next frequency * by using the new frequency of parent devfreq device * using governors except for passive governor. * If the devfreq device has the specific method to decide * the next frequency, should use this callback. * @parent_type: the parent type of the device. * @this: the devfreq instance of own device. * @nb: the notifier block for DEVFREQ_TRANSITION_NOTIFIER or * CPUFREQ_TRANSITION_NOTIFIER list. * @cpu_data_list: the list of cpu frequency data for all cpufreq_policy. * * The devfreq_passive_data have to set the devfreq instance of parent * device with governors except for the passive governor. But, don't need to * initialize the 'this' and 'nb' field because the devfreq core will handle * them.
*/ struct devfreq_passive_data { /* Should set the devfreq instance of parent device */ struct devfreq *parent;
/* Optional callback to decide the next frequency of passvice device */ int (*get_target_freq)(struct devfreq *this, unsignedlong *freq);
/* Should set the type of parent device */ enum devfreq_parent_dev_type parent_type;
/* For passive governor's internal use. Don't need to set them */ struct devfreq *this; struct notifier_block nb; struct list_head cpu_data_list;
};
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